EventProjectionist::instantiate() - Code Metrics - Inspection of "fist stab at snapshotting" - spatie/laravel-event-projector - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 18d381...23e5bd )

by Freek

created 2018-05-26 18:12 UTC

EventProjectionist::instantiate() A

↳ Parent: EventProjectionist

Complexity

Conditions	2
Paths	1

Size

Total Lines	10
Code Lines	5

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
dl	0
loc	10
rs	9.4285
c	0
b	0
f	0
cc	2
eloc	5
nc	1
nop	1

<?php

namespace Spatie\EventProjector;

use Illuminate\Support\Collection;
use Spatie\EventProjector\Models\StoredEvent;
use Spatie\EventProjector\Projectors\Projector;
use Spatie\EventProjector\Events\FinishedEventReplay;
use Spatie\EventProjector\Events\StartingEventReplay;
use Spatie\EventProjector\Exceptions\InvalidEventHandler;
use Spatie\EventProjector\Events\ProjectorDidNotHandlePriorEvents;

class EventProjectionist
{
    /** @var \Illuminate\Support\Collection */
    protected $projectors;

    /** @var \Illuminate\Support\Collection */
    protected $reactors;

    /** @var bool */
    protected $isReplayingEvents = false;

    /** @var int */
    protected $replayChunkSize;

    public function __construct(array $config)
    {
        $this->projectors = collect();

        $this->reactors = collect();

        $this->replayChunkSize = $config['replay_chunk_size'] ?? 1000;
    }

    public function isReplayingEvents(): bool
    {
        return $this->isReplayingEvents;
    }

    public function addProjector($projector): self
    {
        $this->guardAgainstInvalidEventHandler($projector);

        $this->projectors->push($projector);

        return $this;
    }

    public function addProjectors(array $projectors): self
    {
        collect($projectors)->each(function ($projector) {
            $this->addProjector($projector);
        });

        return $this;
    }

    public function getProjectors(): Collection
    {
        return $this->projectors;
    }

    public function getProjector(string $name): ?Projector
    {
        return $this
            ->instantiate($this->projectors)
            ->first(function (Projector $projector) use ($name) {
                return $projector->getName() === $name;
            });
    }

    public function addReactor($reactor): self
    {
        $this->guardAgainstInvalidEventHandler($reactor);

        $this->reactors->push($reactor);

        return $this;
    }

    public function addReactors(array $reactors): self
    {
        collect($reactors)->each(function ($reactor) {
            $this->addReactor($reactor);
        });

        return $this;
    }

    public function handle(StoredEvent $storedEvent)
    {
        $this
            ->callEventHandlers($this->projectors, $storedEvent)
            ->callEventHandlers($this->reactors, $storedEvent);
    }

    protected function callEventHandlers(Collection $eventHandlers, StoredEvent $storedEvent): self
    {
        $eventHandlers
            ->pipe(function (Collection $eventHandler) {
                return $this->instantiate($eventHandler);
            })
            ->filter(function (object $eventHandler) use ($storedEvent) {
                if ($eventHandler instanceof Projector) {
                    if (!$eventHandler->hasReceivedAllPriorEvents($storedEvent)) {
                        event(new ProjectorDidNotHandlePriorEvents($eventHandler, $storedEvent));

                        return false;
                    }
                }

                return true;
            })
            ->each(function (object $eventHandler) use ($storedEvent) {
                $this->callEventHandler($eventHandler, $storedEvent);

                if ($eventHandler instanceof Projector) {
                    $eventHandler->rememberReceivedEvent($storedEvent);
                }
            });

        return $this;
    }

    protected function callEventHandler(object $eventHandler, StoredEvent $storedEvent)
    {
        if (!isset($eventHandler->handlesEvents)) {
            throw InvalidEventHandler::cannotHandleEvents($eventHandler);
        }

        $event = $storedEvent->event;

        if (!$method = $eventHandler->handlesEvents[get_class($event)] ?? false) {
            return;
        }

        if (!method_exists($eventHandler, $method)) {
            throw InvalidEventHandler::eventHandlingMethodDoesNotExist($eventHandler, $event, $method);
        }

        app()->call([$eventHandler, $method], compact('event', 'storedEvent'));
    }

    public function replayEvents(Collection $projectors, callable $onEventReplayed)
    {
        $this->isReplayingEvents = true;

        event(new StartingEventReplay());

        $projectors = $this
            ->instantiate($projectors)
            ->each->resetStatus();

        $this->callMethod($projectors, 'onStartingEventReplay');

        StoredEvent::chunk($this->replayChunkSize, function (Collection $storedEvents) use ($projectors, $onEventReplayed) {
            $storedEvents->each(function (StoredEvent $storedEvent) use ($projectors, $onEventReplayed) {
                $this->callEventHandlers($projectors, $storedEvent);

                $onEventReplayed($storedEvent);
            });
        });

        $this->isReplayingEvents = false;

        event(new FinishedEventReplay());

        $this->callMethod($projectors, 'onFinishedEventReplay');
    }

    protected function guardAgainstInvalidEventHandler($eventHandler)
    {
        if (!is_string($eventHandler)) {
            return;
        }

        if (!class_exists($eventHandler)) {
            throw InvalidEventHandler::doesNotExist($eventHandler);
        }
    }

    protected function instantiate(Collection $eventHandlers)
    {
        return $eventHandlers->map(function ($eventHandler) {
            if (is_string($eventHandler)) {
                $eventHandler = app($eventHandler);
            }

            return $eventHandler;
        });
    }

    protected function callMethod(Collection $eventHandlers, string $method): self
    {
        $eventHandlers
            ->filter(function (object $eventHandler) use ($method) {
                return method_exists($eventHandler, $method);
            })
            ->each(function (object $eventHandler) use ($method) {
                return app()->call([$eventHandler, $method]);
            });

        return $this;
    }
}


1			<?php
2
3			namespace Spatie\EventProjector;
4
5			use Illuminate\Support\Collection;
6			use Spatie\EventProjector\Models\StoredEvent;
7			use Spatie\EventProjector\Projectors\Projector;
8			use Spatie\EventProjector\Events\FinishedEventReplay;
9			use Spatie\EventProjector\Events\StartingEventReplay;
10			use Spatie\EventProjector\Exceptions\InvalidEventHandler;
11			use Spatie\EventProjector\Events\ProjectorDidNotHandlePriorEvents;
12
13			class EventProjectionist
14			{
15			/** @var \Illuminate\Support\Collection */
16			protected $projectors;
17
18			/** @var \Illuminate\Support\Collection */
19			protected $reactors;
20
21			/** @var bool */
22			protected $isReplayingEvents = false;
23
24			/** @var int */
25			protected $replayChunkSize;
26
27			public function __construct(array $config)
28			{
29			$this->projectors = collect();
30
31			$this->reactors = collect();
32
33			$this->replayChunkSize = $config['replay_chunk_size'] ?? 1000;
34			}
35
36			public function isReplayingEvents(): bool
37			{
38			return $this->isReplayingEvents;
39			}
40
41			public function addProjector($projector): self
42			{
43			$this->guardAgainstInvalidEventHandler($projector);
44
45			$this->projectors->push($projector);
46
47			return $this;
48			}
49
50			public function addProjectors(array $projectors): self
51			{
52			collect($projectors)->each(function ($projector) {
53			$this->addProjector($projector);
54			});
55
56			return $this;
57			}
58
59			public function getProjectors(): Collection
60			{
61			return $this->projectors;
62			}
63
64			public function getProjector(string $name): ?Projector
65			{
66			return $this
67			->instantiate($this->projectors)
68			->first(function (Projector $projector) use ($name) {
69			return $projector->getName() === $name;
70			});
71			}
72
73			public function addReactor($reactor): self
74			{
75			$this->guardAgainstInvalidEventHandler($reactor);
76
77			$this->reactors->push($reactor);
78
79			return $this;
80			}
81
82			public function addReactors(array $reactors): self
83			{
84			collect($reactors)->each(function ($reactor) {
85			$this->addReactor($reactor);
86			});
87
88			return $this;
89			}
90
91			public function handle(StoredEvent $storedEvent)
92			{
93			$this
94			->callEventHandlers($this->projectors, $storedEvent)
95			->callEventHandlers($this->reactors, $storedEvent);
96			}
97
98			protected function callEventHandlers(Collection $eventHandlers, StoredEvent $storedEvent): self
99			{
100			$eventHandlers
101			->pipe(function (Collection $eventHandler) {
102			return $this->instantiate($eventHandler);
103			})
104			->filter(function (object $eventHandler) use ($storedEvent) {
105			if ($eventHandler instanceof Projector) {
106			if (!$eventHandler->hasReceivedAllPriorEvents($storedEvent)) {
107			event(new ProjectorDidNotHandlePriorEvents($eventHandler, $storedEvent));
108
109			return false;
110			}
111			}
112
113			return true;
114			})
115			->each(function (object $eventHandler) use ($storedEvent) {
116			$this->callEventHandler($eventHandler, $storedEvent);
117
118			if ($eventHandler instanceof Projector) {
119			$eventHandler->rememberReceivedEvent($storedEvent);
120			}
121			});
122
123			return $this;
124			}
125
126			protected function callEventHandler(object $eventHandler, StoredEvent $storedEvent)
127			{
128			if (!isset($eventHandler->handlesEvents)) {
129			throw InvalidEventHandler::cannotHandleEvents($eventHandler);
130			}
131
132			$event = $storedEvent->event;
133
134			if (!$method = $eventHandler->handlesEvents[get_class($event)] ?? false) {
135			return;
136			}
137
138			if (!method_exists($eventHandler, $method)) {
139			throw InvalidEventHandler::eventHandlingMethodDoesNotExist($eventHandler, $event, $method);
140			}
141
142			app()->call([$eventHandler, $method], compact('event', 'storedEvent'));
143			}
144
145			public function replayEvents(Collection $projectors, callable $onEventReplayed)
146			{
147			$this->isReplayingEvents = true;
148
149			event(new StartingEventReplay());
150
151			$projectors = $this
152			->instantiate($projectors)
153			->each->resetStatus();
154
155			$this->callMethod($projectors, 'onStartingEventReplay');
156
157			StoredEvent::chunk($this->replayChunkSize, function (Collection $storedEvents) use ($projectors, $onEventReplayed) {
158			$storedEvents->each(function (StoredEvent $storedEvent) use ($projectors, $onEventReplayed) {
159			$this->callEventHandlers($projectors, $storedEvent);
160
161			$onEventReplayed($storedEvent);
162			});
163			});
164
165			$this->isReplayingEvents = false;
166
167			event(new FinishedEventReplay());
168
169			$this->callMethod($projectors, 'onFinishedEventReplay');
170			}
171
172			protected function guardAgainstInvalidEventHandler($eventHandler)
173			{
174			if (!is_string($eventHandler)) {
175			return;
176			}
177
178			if (!class_exists($eventHandler)) {
179			throw InvalidEventHandler::doesNotExist($eventHandler);
180			}
181			}
182
183			protected function instantiate(Collection $eventHandlers)
184			{
185			return $eventHandlers->map(function ($eventHandler) {
186			if (is_string($eventHandler)) {
187			$eventHandler = app($eventHandler);
188			}
189
190			return $eventHandler;
191			});
192			}
193
194			protected function callMethod(Collection $eventHandlers, string $method): self
195			{
196			$eventHandlers
197			->filter(function (object $eventHandler) use ($method) {
198			return method_exists($eventHandler, $method);
199			})
200			->each(function (object $eventHandler) use ($method) {
201			return app()->call([$eventHandler, $method]);
202			});
203
204			return $this;
205			}
206			}
207

spatie / laravel-event-projector

Push — master ( 18d381...23e5bd )

EventProjectionist::instantiate() A

Complexity

Size

Duplication

Importance

Duplication Side-by-Side

Filter issues like